Re: [zfs-discuss] what have you been buying for slog and l2arc?

2012-08-07 Thread Anonymous Remailer (austria)
> It depends on the model. Consumer models are less likely to > immediately flush. My understanding that this is done in part to do > some write coalescing and reduce the number of P/E cycles. Enterprise > models should either flush, or contain a super capacitor that provides > enough power for th

Re: [zfs-discuss] what have you been buying for slog and l2arc?

2012-08-07 Thread Sašo Kiselkov
On 08/07/2012 02:18 AM, Christopher George wrote: >> I mean this as constructive criticism, not as angry bickering. I totally >> respect you guys doing your own thing. > > Thanks, I'll try my best to address your comments... Thanks for your kind reply, though there are some points I'd like to add

Re: [zfs-discuss] what have you been buying for slog and l2arc?

2012-08-07 Thread Michael Hase
On Mon, 6 Aug 2012, Christopher George wrote: I mean this as constructive criticism, not as angry bickering. I totally respect you guys doing your own thing. Thanks, I'll try my best to address your comments... *) At least updated benchmarks your site to compare against modern flash-based

Re: [zfs-discuss] what have you been buying for slog and l2arc?

2012-08-07 Thread Bob Friesenhahn
On Tue, 7 Aug 2012, Sašo Kiselkov wrote: MLC is so much cheaper that you can simply slap on twice as much and use the rest for ECC, mirroring or simply overprovisioning sectors. The common practice to extending the lifecycle of MLC is by "short-stroking" it, i.e. using only a fraction of the cap

Re: [zfs-discuss] what have you been buying for slog and l2arc?

2012-08-07 Thread Sašo Kiselkov
On 08/07/2012 04:08 PM, Bob Friesenhahn wrote: > On Tue, 7 Aug 2012, Sašo Kiselkov wrote: >> >> MLC is so much cheaper that you can simply slap on twice as much and use >> the rest for ECC, mirroring or simply overprovisioning sectors. The >> common practice to extending the lifecycle of MLC is by

Re: [zfs-discuss] what have you been buying for slog and l2arc?

2012-08-07 Thread Christopher George
Very impressive iops numbers. Although I have some thoughts on the benchmarking method itself. Imho the comparison shouldn't be raw iops numbers on the ddrdrive itself as tested with iometer (it's only 4gb), The purpose of the benchmarks presented is to isolate the inherent capability of just